Centrifugal-machine buffer device.



By MLLER. GENTRIFUGAL MAGHINE BUITEB. DEVIGE AEPLICATION FILED AUG. 16,1907.

928,996. 1 Patented Ju1 y27, 1909.

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BRUNO MULLER, OF WITTGENSDORF, NEAR CHEMNITZ, GERMANY.

i GENTRIFUGAL-MACHINE BUFFER DEVICE.

Specificaton of Letters Patent.

Application filed August 16, 1907.

Patented July 27, 1909.

Serial No. 388,858.

To ati whom it may concern:

Be it known that I, BRUNO MLLER, a subject of the German Emperor,residing at ii ittgensdorf, near Chennitz, in the Kingdoni of Saxony andEmpire of Germany, have invented certain new and useful linprovements inCentrifugal-Machine Buffer Devices, of which the following is aspecification.

This invention relates to improvements in bufi er devices forcentrifugal machines of that class wherein a vertical shaft is employedand wherein the shaft is held in a. Ve'tical position by tie-rodsconnected by butl'ers with the niachine.

One of the principal objects of the invention is the provision of animproved yielding bufi'er device designed and constructed in such amanner as to equally distribute the strain imposed upon the yieldingportion of the bufi'er and to generally hold the same in concentricrelation with respect to the tierods on which it is disposed so that thebore through which the rod projects will not be worn eccentrically asthe result of an unequal inposition of strain at different points.

The invention will be more fully described in connection with theaccompanying drawings and will be more particularly pointed out andascertained in and by the appended clain.

In the drawings z-Figure 1 is a side elevation of a centrifugal machineshowing my improved buiier device as applied theretoj Fig. 2 is alongitudinal vertical section of one of the bufers. Fig. 3 is an endelevation of one of the butters with the rod in section.

Like characters of reference designate Similar parts throughout thedifferent figures of the drawing.

A eonventional form of centrifugal inachine is indicated at .A and maybe provided with a vertically disposed shaft (not shown) adapted to bedriven from a pulley B. The vertical shaft is held in a substantiallyvertical position by a plurality of tie-rods a which may be connectedwith the shaft in any desirable manner and which extend radiallyoutwardly through the machine as indicated in Fig. 1. At that point ofthe frame where the rods a extend through bufer abutments a' are formed.lChe rods a also have buffer abutnents which are adjustable on said rodand which may comprise washers held in place by nuts f' and g the latterbeing the usual look nut. i

Bufers of yielding material, such for instance as rubber, are indicatedat Z) and said buffers are disposed npon the rods a between thestationary abntments a' and the adjustable rod abutment so as toyieldingly hold the rods in a normal position and permit them to moveinwardly or outwardly a slight distance. The bu'fers b are forced toreceive the rods a and the bores in the bufiers b are preferablyconcentrically disposed therein.- The .bufers b are recessed in theirend portions as indicated at b' and said recesses are centrally disposedand concentric with respect to the bores of the buffer. It will thus beseen that the ends of the bntfer present engaging portions b to thebufier abutment radially outwardly from the recesses b'. Bushings c areloosely disposed on the rod a and are anchored in the recesses b'.Preferably said bushings c are provided with an annular rim or flange (Zwhich rojects into the body of the bufier Z) and serves to hold thebushings c within the recesses and against the inner walls thereof;Preferably said bushings c are reduced in thickness with respect to thedepth of the recesses b' so as to leave spaces e between said bushingsand their corresponding ahutments, as clearly shown in Fig. 2.

It will be seen that the bushings c can have no inovenent other than anovement parallel with the axis of the rod a and inasmuch as thebushings engage the buifer b at points inwardly with respect to theengagement of the abutment it will be impossible for the bores of thebufer b to wear eccentrically with respect to the periphery of thebufer. In other words the bushings c will hold the buifer in concentricrelation with respect to the rods a. It will also be noted that when thenuts f and g are turned'up so as to take up the play or spaces e andplace the bulfer under tension to a snficient extent to effectengagenent between the bushings c and their corresponding abutments,that the said bufi'er will be initially under compression and thereforeshould there be any difference of density or other defect in the rubbersuch as would tend to cause one part to yield nore than another part thepreliminary or additional tension would neutralize such defect and wouldcause a distrbution of Strain, inposed on the bashing 0, throughout acorrespondingly diametrical area surrounding the rod a. Thisconstruction further prevents the bores ofthe buffer Z) from Wearingeccentrically.

A bufiier device for centrifugal machines comprising 'in combinationwith an ahutment, a te rod projecting therethrough, a yielding bufferloosely disposd on said tie rod and composed of a homogeneous mass, saidbuffer being provided With recesses in its ends, bushings looselydisposed on said rod and fitting in said recesses, each of said bushingsbeing of less Width than the depth of' its respective recess, saidbushings having peripherally projecting flanges -eXceeding the diameterof said recesses and projecting into the Walls thereof to hold thebushing's against the bases of said recesses and provide open spacesbetween the outer faces of said bnshings and the end faces `of saidbufier and maintain said buffer in concentric relation With said tierod, and means disposed on said te rod to place the buffer under normaltension and affect engagement of Said means with one of said bushingsand also engage the other of said bnshings jVth said abutment,substantially as described.

In testimony whereof, I aflix my signature in presence of two witnesses.

BRUNO MULLER. XVitnesses:

KARL VoPEL, THOMAS H. NORTON.

